org.dlese.dpc.index

Class LuceneFieldComparator

java.lang.Object

org.dlese.dpc.index.LuceneFieldComparator

All Implemented Interfaces:

java.util.Comparator

Deprecated.

Sorting should now be done by supplying a Sort object at search time. Sorting on returned ResultDocs is less efficient and may cause OutOfMemory errors on large result sets.

public class LuceneFieldComparator
extends java.lang.Object
implements java.util.Comparator

Compares two ResultDocs for sorting by a given Lucene field. Fields that are encoded as a Dates will be sorted by Date, all others are sorted lexically. The lucene fields must be stored as text or keyword. The name of the field to be sorted must be passed into the constructor of this LuceneFieldComparator.

Author:

John Weatherley

See Also:

ResultDoc

Field Summary

Fields

Modifier and Type	Field and Description
static int	ASCENDING Deprecated. Used to sort in ascending order.
static int	DESCENDING Deprecated. Used to sort in descending order.

Constructor Summary

Constructors

Constructor and Description
LuceneFieldComparator(java.lang.String fieldName, int sortOrder) Deprecated. Sorting should now be done by supplying a Sort object at search time. Sorting on returned ResultDocs is less efficient and may cause OutOfMemory errors on large result sets.

Method Summary

Modifier and Type	Method and Description
int	compare(java.lang.Object o1, java.lang.Object o2) Deprecated. Compares two ResultDocs for sorting by a Lucene field, indicated at construction time.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Detail

ASCENDING

public static final int ASCENDING

Deprecated.

Used to sort in ascending order.

See Also:

Constant Field Values

DESCENDING

public static final int DESCENDING

Deprecated.

Used to sort in descending order.

See Also:

Constant Field Values

Constructor Detail

LuceneFieldComparator

public LuceneFieldComparator(java.lang.String fieldName,
                             int sortOrder)

Deprecated. Sorting should now be done by supplying a Sort object at search time. Sorting on returned ResultDocs is less efficient and may cause OutOfMemory errors on large result sets.

Constructor for this LuceneFieldComparator object.

Parameters:

fieldName - Field to sort by

sortOrder - ASCENDING or DESCENDING

Method Detail

compare

public int compare(java.lang.Object o1,
                   java.lang.Object o2)

Deprecated.

Compares two ResultDocs for sorting by a Lucene field, indicated at construction time.

Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

Specified by:

compare in interface java.util.Comparator

Parameters:

o1 - The first Object.

o2 - The second Object.

Returns:

An int indicating sort order.